Convertible backpack



FIG. 1 is a front perspective view of the convertible backpack showing our new design.

FIG. 2 is a front elevational view thereof;

FIG. 3 is a back elevational view thereof;

FIG. 4 is a side elevational view thereof;

FIG. 5 is another side elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines in FIGS. 1-7 illustrate portions of the convertible backpack that do not form part of the claimed design. 

CLAIM The ornamental design for a convertible backpack, as shown and described. 